package map;

import java.util.HashMap;

/**
 * Created with IDEA
 * author:Yhk
 * Date:2019/3/7
 * Time:9:31 AM
 */
public class map {

    public static void main(String[] args) {
        HashMap map = new HashMap();
        map.put("a",11);
        map.put("a",22);
        System.out.println(map.size());
        System.out.println(map.get("a"));
    } 
}
